mineral

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂), cryptocrystalline to microcrystalline variety

AI-generated identification · may be incorrect

Typically white to translucent with a glassy-to-waxy luster; Mohs hardness 7, no cleavage, conchoidal fracture, trigonal crystal structure, and specific gravity about 2.65. The smoothly rounded shape indicates tumbling or natural water wear.

Identified September 13, 2026More mineral →

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Physical properties

Formation & geological history

Formed when silica-rich fluids crystallized in veins or cavities, commonly in igneous and metamorphic rocks; quartz ranges from Precambrian to modern in age. The specimen was likely mechanically polished or water-worn.

Uses & applications

Used for carvings, decorative stone, lapidary work, countertops, abrasives, and inexpensive jewelry. Common tumbled pieces generally have modest collector value.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or impurities that scatter light. Quartz is one of Earth’s most abundant minerals and is a major component of granite, sandstone, and many metamorphic rocks.

Field identification & locations

Identify by its hardness, white translucency, lack of cleavage, and conchoidal fracture; it should scratch glass but not be scratched by a steel knife. Common worldwide, especially in quartz veins, river gravels, and pegmatites.